/* Genel Stiller ve Resetleme */
:root {
    --primary-color: #1a73e8;
    --primary-dark: #1765cc;
    --background-color: #f8f9fa;
    --surface-color: #ffffff;
    --text-color: #202124;
    --text-light: #5f6368;
    --border-color: #dadce0;
    --success-color: #1e8e3e;
    --success-light: #e6f4ea;
    --error-color: #d93025;
    --error-light: #fce8e6;
    --correction-color: #f9ab00;
    --correction-light: #fff8e1;
    --font-family: 'Poppins', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 700px;
    padding-top: 20px;
}

.screen {
    width: 100%;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 2px 6px 2px rgba(60,64,67,0.15);
    padding: 30px 40px;
    animation: fadeIn 0.5s ease-in-out;
    position: relative;
    display: flex;
    flex-direction: column;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.hidden {
    display: none !important;
}

button {
    font-family: var(--font-family);
    cursor: pointer;
    border: none;
    border-radius: 8px;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.2s ease-in-out;
    -webkit-tap-highlight-color: transparent;
}

button:active {
    transform: scale(0.98);
}

.error-message {
    color: var(--error-color);
    font-size: 14px;
    margin-top: 10px;
    height: 20px;
    transition: opacity 0.3s;
}

.screen-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-color);
    text-align: center;
    margin-bottom: 8px;
}

.screen-subtitle {
    font-size: 15px;
    color: var(--text-light);
    text-align: center;
    margin-bottom: 30px;
}

.back-btn {
    background: none;
    border: none;
    font-size: 28px;
    font-weight: bold;
    color: var(--text-light);
    position: absolute;
    top: 50%;
    left: 25px;
    padding: 5px;
    line-height: 1;
    transform: translateY(-50%);
}

.back-btn:hover {
    color: var(--text-color);
    transform: translateY(-50%) scale(1.1);
}